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ActiveMQ example source code file (ActiveMQMessageAuditNoSync.java)

This example ActiveMQ source code file (ActiveMQMessageAuditNoSync.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - ActiveMQ tags/keywords

activemqmessageauditnosync, bitarraybin, bitarraybin, default_window_size, io, jmsexception, lrucache, maximum_producer_count, messageid, messageid, messagereference, messagereference, producerid, string, string

The ActiveMQ ActiveMQMessageAuditNoSync.java source code

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.activemq;

import java.io.Serializable;

import javax.jms.JMSException;
import javax.jms.Message;

import org.apache.activemq.broker.region.MessageReference;
import org.apache.activemq.command.MessageId;
import org.apache.activemq.command.ProducerId;
import org.apache.activemq.util.BitArrayBin;
import org.apache.activemq.util.IdGenerator;
import org.apache.activemq.util.LRUCache;

/**
 * Provides basic audit functions for Messages without sync
 * 
 * 
 */
public class ActiveMQMessageAuditNoSync implements Serializable {

    private static final long serialVersionUID = 1L;

    public static final int DEFAULT_WINDOW_SIZE = 2048;
    public static final int MAXIMUM_PRODUCER_COUNT = 64;
    private int auditDepth;
    private int maximumNumberOfProducersToTrack;
    private LRUCache<Object, BitArrayBin> map;

    /**
     * Default Constructor windowSize = 2048, maximumNumberOfProducersToTrack =
     * 64
     */
    public ActiveMQMessageAuditNoSync() {
        this(DEFAULT_WINDOW_SIZE, MAXIMUM_PRODUCER_COUNT);
    }

    /**
     * Construct a MessageAudit
     * 
     * @param auditDepth range of ids to track
     * @param maximumNumberOfProducersToTrack number of producers expected in
     *                the system
     */
    public ActiveMQMessageAuditNoSync(int auditDepth, final int maximumNumberOfProducersToTrack) {
        this.auditDepth = auditDepth;
        this.maximumNumberOfProducersToTrack=maximumNumberOfProducersToTrack;
        this.map = new LRUCache<Object, BitArrayBin>(0, maximumNumberOfProducersToTrack, 0.75f, true);
    }
    
    /**
     * @return the auditDepth
     */
    public int getAuditDepth() {
        return auditDepth;
    }

    /**
     * @param auditDepth the auditDepth to set
     */
    public void setAuditDepth(int auditDepth) {
        this.auditDepth = auditDepth;
    }

    /**
     * @return the maximumNumberOfProducersToTrack
     */
    public int getMaximumNumberOfProducersToTrack() {
        return maximumNumberOfProducersToTrack;
    }

    /**
     * @param maximumNumberOfProducersToTrack the maximumNumberOfProducersToTrack to set
     */
    public void setMaximumNumberOfProducersToTrack(
            int maximumNumberOfProducersToTrack) {
        this.maximumNumberOfProducersToTrack = maximumNumberOfProducersToTrack;
        this.map.setMaxCacheSize(maximumNumberOfProducersToTrack);
    }

    /**
     * Checks if this message has been seen before
     * 
     * @param message
     * @return true if the message is a duplicate
     * @throws JMSException
     */
    public boolean isDuplicate(Message message) throws JMSException {
        return isDuplicate(message.getJMSMessageID());
    }

    /**
     * checks whether this messageId has been seen before and adds this
     * messageId to the list
     * 
     * @param id
     * @return true if the message is a duplicate
     */
    public boolean isDuplicate(String id) {
        boolean answer = false;
        String seed = IdGenerator.getSeedFromId(id);
        if (seed != null) {
            BitArrayBin bab = map.get(seed);
            if (bab == null) {
                bab = new BitArrayBin(auditDepth);
                map.put(seed, bab);
            }
            long index = IdGenerator.getSequenceFromId(id);
            if (index >= 0) {
                answer = bab.setBit(index, true);
            }
        }
        return answer;
    }

    /**
     * Checks if this message has been seen before
     * 
     * @param message
     * @return true if the message is a duplicate
     */
    public boolean isDuplicate(final MessageReference message) {
        MessageId id = message.getMessageId();
        return isDuplicate(id);
    }
    
    /**
     * Checks if this messageId has been seen before
     * 
     * @param id
     * @return true if the message is a duplicate
     */
    public boolean isDuplicate(final MessageId id) {
        boolean answer = false;
        
        if (id != null) {
            ProducerId pid = id.getProducerId();
            if (pid != null) {
                BitArrayBin bab = map.get(pid);
                if (bab == null) {
                    bab = new BitArrayBin(auditDepth);
                    map.put(pid, bab);
                }
                answer = bab.setBit(id.getProducerSequenceId(), true);
            }
        }
        return answer;
    }

    /**
     * mark this message as being received
     * 
     * @param message
     */
    public void rollback(final MessageReference message) {
        MessageId id = message.getMessageId();
        rollback(id);
    }
    
    /**
     * mark this message as being received
     * 
     * @param id
     */
    public void rollback(final  MessageId id) {
        if (id != null) {
            ProducerId pid = id.getProducerId();
            if (pid != null) {
                BitArrayBin bab = map.get(pid);
                if (bab != null) {
                    bab.setBit(id.getProducerSequenceId(), false);
                }
            }
        }
    }
    
    /**
     * Check the message is in order
     * @param msg
     * @return
     * @throws JMSException
     */
    public boolean isInOrder(Message msg) throws JMSException {
        return isInOrder(msg.getJMSMessageID());
    }
    
    /**
     * Check the message id is in order
     * @param id
     * @return
     */
    public boolean isInOrder(final String id) {
        boolean answer = true;
        
        if (id != null) {
            String seed = IdGenerator.getSeedFromId(id);
            if (seed != null) {
                BitArrayBin bab = map.get(seed);
                if (bab != null) {
                    long index = IdGenerator.getSequenceFromId(id);
                    answer = bab.isInOrder(index);
                }
               
            }
        }
        return answer;
    }
    
    /**
     * Check the MessageId is in order
     * @param message 
     * @return
     */
    public boolean isInOrder(final MessageReference message) {
        return isInOrder(message.getMessageId());
    }
    
    /**
     * Check the MessageId is in order
     * @param id
     * @return
     */
    public boolean isInOrder(final MessageId id) {
        boolean answer = false;

        if (id != null) {
            ProducerId pid = id.getProducerId();
            if (pid != null) {
                BitArrayBin bab = map.get(pid);
                if (bab == null) {
                    bab = new BitArrayBin(auditDepth);
                    map.put(pid, bab);
                }
                answer = bab.isInOrder(id.getProducerSequenceId());

            }
        }
        return answer;
    }

    public long getLastSeqId(ProducerId id) {
        long result = -1;
        BitArrayBin bab = map.get(id.toString() + ":");
        if (bab != null) {
            result = bab.getLastSetIndex();
        }
        return result;
    }

    public void clear() {
        map.clear();
    }
}

Other ActiveMQ examples (source code examples)

Here is a short list of links related to this ActiveMQ ActiveMQMessageAuditNoSync.java source code file:

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